Ocular surface structures (OSS)

The ocular surface structures comprise a complex functional unit including the cornea, conjunctiva, eyelids, and the pre-ocular tear film, all working together to maintain optical clarity and protect the eye from environmental insults. This system is not a single molecular target but rather an anatomical region where various receptors, enzymes, and signaling pathways are targeted to treat ocular diseases. The primary biological role of the ocular surface is to provide a smooth refractive surface for vision and a robust immunological and physical barrier against pathogens and debris. In pathological states such as dry eye disease or chronic inflammation, the homeostasis of these structures is disrupted, leading to pain, visual impairment, and tissue damage. Therapeutic interventions often focus on specific molecular targets within these structures, such as T-cell mediated inflammation or goblet cell mucin secretion, to restore the integrity of the ocular surface unit.

Other names

Ocular surfaceOcular surface unitOcular surface system

Drugs targeting the ocular surface typically act by modulating inflammation (calcineurin inhibition, integrin antagonism), stimulating tear production (nicotinic acetylcholine receptor agonism), or providing physical lubrication and tear film stabilization.